For Plastic Extrusion & Injection Molding Feed Screws
Specialized alloy coatings for root diameters, utilizing Flite Technology’s
PLASMA-BOND welding system.
Excellent bond strength and virtually no heat build up on screw. Eliminates
distortion and other problems associated with conventional welding methods.
Now feed screw with sever root damage, heavy scoring and abundant pitting
can be sectored to original tolerances and finishes. We can also reclaim
worn screws that were rebuilt several times or subjected to improper
polishing during rebuilding. Part or all of the root diameter areas can
be coated.
Korgard, our most popular repair alloy, is also chrome platable.
Root coatings for use under extreme abrasive and corrosive conditions
are also available. Standard screw base material ex. 4140 often lacks
the properties for substantial longevity in these situations.
Listed below are a few of these coatings with comparative property data.
Chemical Compositions
Alloy
Cr
C
Si
Mn
Mo
Fe
Ni
Co
B
W
Others
Cobalt-Base
FTPB-60
28
1.1
1
1*
1*
3*
3*
Bal
--
4
--
Intermetallic Compounds
FTPB-400
8.5
0.08*
2.6
--
28.5
--
--
Bal
--
--
Ni+Fe=3*
FTPB-700
15.5
0.08*
3.4
--
32.5
--
Bal
--
--
--
Co+FE+3*
FTPB-800
17.5
0.08*
3.4
--
28.5
--
--
Bal
--
--
Ni+Fe=3*
+Major elements only *Maximum
**Includes Ni
Comparative Average Hot Hardness
Diamond Pyramid hardness (DPH), kg/mm2
Test temperature, degrees F (degrees C)
800
1000
1220
1400
Alloy
(427)
(538)
(649)
(760)
FTPB-60
300
275
260
185
FTPB-400
605
585
585
335
FTPB-700
540
510
410
245
FTPB-800
555
555
500
295
FTPB-150C
190
185
170
145
Comparative Average Abrasive Wear Data*
Alloy
Volume Loss (mm3)
Wear Coefficient**
FTPB-60
66
13 x 10-4
FTPB-400
29
7 x 10-4
FTPB-800
18
4 x 10 10-4
FTPB-150C
105
12 x 10-4
FTPB-700
51
13 - 10-4
*Tested for 200 revolutions at a load of 30 lbs (13.6
Kg) using a 9" (229mm) diameter rubber wheel and dry sand.
** Wear coefficient (K) is calculated from V = KPL/h, where V = wear
volume in mm3, P = load kg; L = sliding distance in mm: and High h
= diamond pyramid hardness. A combination of a low wear coefficient
and High hardness is desirable for good wear resistance.
Comparative Average Adhesive Wear Data*
Volume loss (mm3)
Alloy
90 lb. load (40.9 kg)
150 lb. load (68.2 kg)
210 lb. load (95.5 kg)
FTPB-60
1
2.6
9.5
FTPB-400
0.70
1.28
2.35
FTPB-700
0.07
0.09
0.19
FTPB-800
1.24
1.67
1.91
FTPB-150C
0.3
0.4
2.3
*Average of two or more tests in air against a case-hardened
SAE 4620 steel ring (Rockwell C-63). Ring is rotated at 80 rpm. Total
sliding distance is 2.2 x 105 mm.
Comparative Corrosion Data*
Media, concentrations and temperatures
Alloy
30% formic acid, 150ºF (66ºC)
30% acetic acid, boiling
5% sulfric acid,
150ºF (66ºC)
65% nitric acid,
150ºF (66ºC)
FTPB-60
1
1
1
4
FTPB-400
2
1
2
4
FTPB-700
1
1
1
3
FTPB-800
--
1
2
--
FTPB-150C
1
1
1
3
*Five 24hr. test periods. Determined in laboratory
tests. Samples should be tested under actual plant conditions.
Code:
1 = less than 5 mpy (<0.13 mm/y)
2 = 5mpy (0.13mm/y) to 20mpy (0.51mm/y)
3 = more than 20mpy (>0.51 mm/y) to 50mpy (1.27 mm/y)
4 = more than
50mpy (>1.27 mm/y)
Comparative Average Charpy (Un-notched) Impact
Strength*
Alloy
ft. lb.
J
FTPB-60
17
23
FTPB-400
3.5
4.1
FTPB-700
2
2.7
FTPB-150C
>20
>27.1
*Undiluted deposits tested at room temperature
Tungsten root coatings are also available, plus other
coatings for dimensionally changing root diameters.
North American Feed Screw and Barrel
Manufacturers-Rebuilders Assoc.
Corporate 2511 N Friday Rd.
Cocoa, Florida 32926
United States
321-631-2050, 800-327-9310
FAX - 321-636-3508 flitetech@gmail.com
Para Spanish Teléfono: 321-433-3315
419 Hawk St Rockledge FL.32955
440 Shearer Blvd Cocoa Fl. 32922
Atlanta GA 30342
North Royalton OH 44133
Lynchburg, VA 24502
Brodheadsville, PA 18322
Andover, MA 01810
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